Catch an exception when deleting an FileUpload object and target file is missing.
Catch an exception when deleting an FileUpload object and target file is missing.

pombredanne/https-git.fedorahosted.org-git-kobo,pombredanne/https-git.fedorahosted.org-git-kobo,pombredanne/https-git.fedorahosted.org-git-kobo,pombredanne/https-git.fedorahosted.org-git-kobo,release-engineering/kobo,release-engineering/kobo,release-engineering/kobo,release-engineering/kobo